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# Problem Tags Rating Solved
288-E Polo the Penguin and Lucky Numbers
dp implementation math
2800
288-D Polo the Penguin and Trees
combinatorics dfs and similar trees
2400
288-C Polo the Penguin and XOR operation
implementation math
1700
288-B Polo the Penguin and Houses
combinatorics
1500
288-A Polo the Penguin and Strings
greedy
1300
287-B Pipeline
binary search math
1700
287-A IQ Test
brute force implementation
1100
286-E Ladies' Shop
constructive algorithms fft math
2800
286-D Tourists
data structures sortings
2600
286-C Main Sequence
greedy implementation
2100
286-B Shifting
implementation
2200
286-A Lucky Permutation
constructive algorithms math
1400
285-E Positions in Permutations
combinatorics dp math
2600
285-D Permutation Sum
bitmasks combinatorics dp +2
1900
285-C Building Permutation
greedy implementation sortings
1200
285-B Find Marble
implementation
1200
285-A Slightly Decreasing Permutations
greedy implementation
1100
284-B Cows and Poker Game
brute force implementation
1000
284-A Cows and Primitive Roots
implementation math number theory
1400
283-E Cow Tennis Tournament
combinatorics data structures math
2800
283-D Cows and Cool Sequences
dp math number theory
2400
283-C Coin Troubles
dp
2100
283-B Cow Program
dfs and similar dp graphs
1700
283-A Cows and Sequence
constructive algorithms data structures implementation
1600
282-E Sausage Maximization
bitmasks data structures trees
2200
282-D Yet Another Number Game
dp games
2100
282-C XOR and OR
constructive algorithms implementation math
1500
282-B Painting Eggs
greedy math
1500
282-A Bit++
implementation
800
281-B Nearest Fraction
brute force implementation two pointers
1700
281-A Word Capitalization
implementation strings
800
280-E Sequence Transformation
brute force data structures dp +2
3000
280-D k-Maximum Subsequence Sum
data structures flows graphs +1
2800
280-C Game on Tree
implementation math probabilities +1
2200
280-B Maximum Xor Secondary
data structures implementation two pointers
1800
280-A Rectangle Puzzle
geometry
2000
279-E Beautiful Decomposition
dp games greedy +1
1900
279-D The Minimum Number of Variables
bitmasks dp
2200
279-C Ladder
dp implementation two pointers
1700
279-B Books
binary search brute force implementation +1
1400
279-A Point on Spiral
brute force geometry implementation
1400
278-B New Problem
brute force strings
1500
278-A Circle Line
implementation
800
277-E Binary Tree on Plane
flows trees
2400
277-D Google Code Jam
dp probabilities
2800
277-C Game
games implementation
2400
277-B Set of Points
constructive algorithms geometry
2300
277-A Learning Languages
dfs and similar dsu
1400
276-E Little Girl and Problem on Trees
data structures graphs trees
2100
276-D Little Girl and Maximum XOR
bitmasks dp greedy +2
1700